Overlay covers whole dive - but keep fonts white - css

Question

I trying to change the brightess of a div (not only an image brightness). Generaly there is an image in a div, description and caption, the main div background color is white. I want to show ovarlay div onmouse hover. Idea is to cover main div with overlay div. But now I getting only the image brightness change , what I want to achieve is to cover the hole div and keep whithe fonts.
When I add a thumbnail brightness effect it also influence the fonts to became darker. how to do that keeping fonts white.
col-sm-6, caption, thumbnail classes are defined by bootstrap.
The code of:
<div class="hovereffect thumbnail Staffinview1 delay1s">
<img src="./images/photo.jpg">
<div class="overlay">
<?php echo Person_description; ?>
</div>
<div class="caption">
<h3>Name Surname</h3>
</div>
</div>
</div>
The css code:
.thumbnail:hover {
transition: all 0.5s ease-in-out;
-moz-transition: all 0.5s ease-in-out;
-webkit-transition: all 0.5s ease-in-out;
-o-transition: all 0.5s ease-in-out;
-ms-transition: all 0.5s ease-in-out;
box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.5);
}
.hovereffect {
width: 100%;
height: 100%;
float: left;
overflow: hidden;
position: relative;
text-align: center;
cursor: default;
}
.hovereffect .overlay {
position: absolute;
overflow: hidden;
width: 80%;
height: 80%;
left: 10%;
top: 10%;
border-bottom: 1px solid #FFF;
border-top: 1px solid #FFF;
-webkit-transition: opacity 0.35s, -webkit-transform 0.35s;
transition: opacity 0.35s, transform 0.35s;
-webkit-transform: scale(0,1);
-ms-transform: scale(0,1);
transform: scale(0,1);
color: #fff;
}
.hovereffect:hover .overlay {
opacity: 1;
filter: alpha(opacity=100);
-webkit-transform: scale(1);
-ms-transform: scale(1);
transform: scale(1);
}
.hovereffect img {
display: block;
position: relative;
-webkit-transition: all 0.35s;
transition: all 0.35s;
}
.hovereffect:hover img{
filter: url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg"><filter id="filter"><feComponentTransfer color-interpolation-filters="sRGB"><feFuncR type="linear" slope="0.6" /><feFuncG type="linear" slope="0.6" /><feFuncB type="linear" slope="0.6" /> </feComponentTransfer></filter></svg>#filter');
filter: brightness(0.3);
-webkit-filter: brightness(0.3);
}

Answer 1

I believe You are trying to achieve a mask
You can use z-index property and postion:absolute for that overlay div
css rule
.overlay {
position: absolute;
width: 100%;
height: 100%;
top: 0%;
z-index: 0;
transition: all 0.5s;
}
.overlay:hover {
z-index: 1;
background: rgb(173, 173, 173);
opacity: 0.5;
}
Snippet below
.thumbnail:hover {
transition: all 0.5s ease - in -out;
- moz - transition: all 0.5s ease - in -out;
- webkit - transition: all 0.5s ease - in -out;
- o - transition: all 0.5s ease - in -out;
- ms - transition: all 0.5s ease - in -out;
box - shadow: 0 12px 16px 0 rgba(0, 0, 0, 0.24), 0 17px 50px 0 rgba(0, 0, 0, 0.5);
}
.hovereffect {
width: 100 %;
height: 100 %;
float: left;
overflow: hidden;
position: relative;
text - align: center;
cursor: default;
}
.hovereffect.overlay {
position: absolute;
overflow: hidden;
width: 80 %;
height: 80 %;
left: 10 %;
top: 10 %;
border - bottom: 1px solid# FFF;
border - top: 1px solid# FFF;
- webkit - transition: opacity 0.35s, -webkit - transform 0.35s;
transition: opacity 0.35s, transform 0.35s;
- webkit - transform: scale(0, 1);
- ms - transform: scale(0, 1);
transform: scale(0, 1);
color: #fff;
}
.hovereffect:hover.overlay {
opacity: 1;
filter: alpha(opacity=100);
- webkit - transform: scale(1);
- ms - transform: scale(1);
transform: scale(1);
}
.hovereffect img {
display: block;
position: relative;
- webkit - transition: all 0.35s;
transition: all 0.35s;
}
.overlay {
position: absolute;
width: 100%;
height: 100%;
top: 0%;
z-index: 0;
transition: all 0.5s;
}
.overlay:hover {
z-index: 1;
background: rgb(173, 173, 173);
opacity: 0.5;
}
<div class="hovereffect thumbnail Staffinview1 delay1s">
<img src="./images/photo.jpg">
<div class="overlay">
<?php echo Person_description; ?>
</div>
<div class="caption">
<h3>Name Surname</h3>
</div>
</div>